diff --git a/collects/profj/libs/java/tester/info.ss b/collects/profj/libs/java/tester/info.ss
index 52b20ab1dd..d1c30e3152 100644
--- a/collects/profj/libs/java/tester/info.ss
+++ b/collects/profj/libs/java/tester/info.ss
@@ -1,3 +1,4 @@
 #lang setup/infotab
 
+(define assume-virtual-sources #t)
 ;; (define install-collection "installer.ss")